Changeable-combination key lock



Jqly 31, 192s. 1,679,087

F. W. JOHNSON CH ANGEABLE COMBINATION KEY LOCK Fi led Nov. 1926 '4 Sheets-Sheet 1 FIGH l/VVE/V TOR;

' July 31, 1928. I 1,679,087

w. JOHNSON GHANGEABLE COMBINATION KEY LOCK FJGZX- FIG/Y- Jul 31, 1928. 1,679,087

F. W. JOHNSON CHANGEABLE COMBINATION KEY LOCK Filed Nov. 8, 1926 4 Sheets-Sheet 4 FIE/U- HGM. Flam Han? 11am Flam F1Cim I .57 v w 1 9 i 27 FIG A51. Ham

Z9 FIQ m Patented July 31, 1928.

UNITED STATES.

FRANK W. JOHNSON, F PHILADELPHIA, PENNSYLVANIA.

CHANGEABLE-COMBINATION KEY LOCK.

Application filed November 8, 1926. Serial No. 146,948.

My invention relates to looks adapted for use in connection with safety deposit boxes and similar inclosures, which are successively leased to different parties to whom is the lesser furnishes a main key adapted to open a given box when the lock thereof is partially operated by a guard key in the possession of the lessor. Such lessees some times fail to return the main keys at the ex- )0 piration of their leases, and in order to render the boxes secure against unauthorized use, it is necessary to change the combinations of the locks thereof before again leasing them. Moreover, even if such lessees return the main keys at the expiration of their leases, it is desirable to change the combinations of the locks whenever the lessees of theboxes are changed, to prevent the otherwise possible use of unauthorized duplicates of the keys which have been re turned;

My present invention renders such a lOCrZ changeable as to the combinations of its turnblers, so that it may be adjustably set to 1; opened by different main keys.

My invention is advantageous in providing a lock of the character described with means whereby the combination controlled by the main key may be readily changed, as without removing the lock or otherwise disturbing its mechanism, by merely inserting in the lock, a combination setting key having bittings corresponding with the main key for which the lock is thus set to be operated. y

As hereinafter described, my invention includes a series of pivot-ed main tun'iblers, subject to operation by main keys, each of said tumblers having a gating at its free end and being independently adjustable to different positions in opposition to respective fences; said fences being spring pressed in one direction but movable, in opposition to the stress of their springs, so as to be set by any set-ting key of the series chosen for that purpose; the setting keys being made in correspondence with the respective main keys as above noted. However, said main tumblers are normally prevented from being operated, by means of a series of auxiliary guard tumblers, which control a stop which normally prevents the operation of the locking bolt by said main key, but which may be released, by an auxiliary guard key, preliminary to the operation of said bolt by the main key. A series of change tumblers are arranged to be actuated by a change key, to present their gatings in alinement to receive a stump carried by said locking bolt; so that the sliding movement of which the latter is capable, is normally limited by said change tumblers which, however, permit abnormal movement of said lock bolt, when the change tumblers are operated. by the change key; which is done Whenever it is desired to change the combination of the lock.

In the form of my invention hereinafter described; said guard key and main keys may be inserted in the same nosing which is, of course, at the front of the lock casing and presented exterior to the inclosure which is to be locked. However, said change key and setting keysare arranged to be used in separate nosings presented at the'back of the lock casing, and, consequently, within said inclosure; so that it is necessary to unlock the inclosure, in order to change the combination of the lock. However, it is to be understood that the nosings for the respective keys may be otherwise arranged. For instance, the guard key and main keys may be provided with separate nosings.

My invention includes the various novel features of construction and arrangement hereinafter more definitely specified.

In thedrawings; Fig. I is a front elevation of a lockeonveniently embodying my invention, with its locking slide bolt in locked position.

Fig. II is a rear elevation of the lock shown in Fig. I, with its locking'slide bolt in locked posit-ion.

Fig. III is an elevation of the right hand end of said lock as shown in Fig. I, which is the left hand end of said lock as shown in Fig. II. I

Fig. IV is a front elevation of said lock shown in Figs. I to III inclusive, with its mechanism in the same locked position, but with the front cover plate removed, toshow the relative position of the elements of said mechanism which are normally conceailed by said plate.

Fig. V is. a front elevation of said look, similar to Fig. IV, but showing the rotary key hub, which is common to the guard key and main keys, turned one-sixth revolution clockwise, which is the full extent of its movement by the guard key, preliminary to the unlocking movement of said slide bolt,

by the main key for which the mechanism lob llU

has been adjusted. However, said key hub must be turned counter-clockwise by the guard key to the position shown in Figs.

I and IV, and said guard key withdrawn, before said main key can be inserted.

Fi VI is a front elevation of said lock, similar to Figs. IV and V, but showing said rotary key hub returned in the same direction as in F i V, and one-quarter revolution clockwise from its initial position, but by the main key for which it has been adjusted; so as to shift said locking bolt to its normal unlocked position, which is shown in Fig. VI.

Fig. VII is a front elevation of said lock, similar to Fig. VI, but with the change tumblers unlocked, to permit the combination to be changed. Such change is effected by leaving said main key in its key hub, with the lock in unlocked position, and inserting the change key in its rotary hub, in the back of the lock, and turning the change key one-quarter revolution counter-clockwise, as viewed from the back of the lock. Such movement presents the gating; of the change tumblers in registry with said stump on the slide bolt; so that the-main key may then be turned one-quarter revolution more, clockwise, to shift the lock bolt to the abnormal extent necessary to change the combination. Thereupon, said main key may be withdrawn. Such abnormal unlocking movement of the slide bolt releases a detent lever holding the setting key; so that the setting key which has been in. position in the lock, maintaining a corresponding combination for the main key aforesaid, may be turned onequarter revolution, clockwise, as viewed from the back of the lock, andbe withdrawn.

Thereupon, the slidebolt may be restored to locked position, by any means capable of engaging and turning the rotary key hub which is common to said guard key and main keys, one-half revolution counter-clockwise, to the position shown in FigQI. Such movement may be effected by inserting the point of a screw driver in. said rotary key hub, but I prefer to provide a key for that purpose. hereinafter termed the dummy key. Thereupon, the combination of said lock may be changed by inserting any of the series of setting keys in the rotary setting key hub, at the back of the lock, while the slot in said hub is in horizontal plane, and turning said hub one-quarter revolution counter-clockwise, as viewed from the back of the lock. Such movement causes said setting key to be engaged by the detent aforesaid so that the new setting key thus inserted is automatically retained until released, by the abnormal unlocking movement of the slide bolt above contemplated.

Fig. VIII is a. front elevation of said look, similar to Fig. IV, but with the combination changed as aforesaid. It may be observed ige'raosv that said fences are in a different position from that shown in Fig. IV. Fig. VIII also shows the lock in its normal locked position as in Figs. I to IV inclusive; so that Fig. VIII differs from Fig. IV only as to the position of said fences.

Fig. IX is a vertical sectional view of said lock, taken on the line IX, IX in Figs. I and IV.

Fig. X is a vertical sectional view of said lock, taken on the line X, X in Figs. I and IV. V V V Fig. XI is a plan sectional view of said lock, taken on the line XI, XI in Figs. I and IV.

Fig. XII is a plan sectional view of said lock, taken on the line XII, XII in Fig. VII, but including the casing cover.

Fig. XIII is a side elevation of the guard key of said lock.

Fig. XIV is an elevation of the main key to which said lock mechanism is adjusted when thefences for the main tumblers are in the position shown in Figs. IV to VI inclusive.

Fig. XV is an elevation of the different main key to which said lock mechanism is adjusted when said fences are in the position shown in Fig. VIII.

Fig. XVI is an elevation of the setting key corresponding with the main key shown in Fig. XIV, and its loose handle.

Fig. XVII is an elevation of the set-ting key corresponding with the different main key shown in Fig. XV.

Fig. XVIII is an elevation of the change key.

Fig. XIX is an elevation of the dummy key.

Fig. XX is a front elevation of the locking bolt with the setting key detent in position to retain the setting key.

Fig. XXI is a. front elevation of said look ing bolt in its extreme, unlocked, position, with said detent in released position.

Fig. XXII is a front elevation of one of: the partition plates which separate the fences and main tumblers in corresponding pairs.

Fig. XXIII is a front elevation of the guard lever which is manipulated by said guard key shown in Fig. XIII.

In said figures; 1 is a locking bolt which is fitted to slide in the lock casing 2 having the front cover 3 remo-vably secured by the single screw 4; in threaded en agement with the socket 5 in said casing. Said bolt slides on the stationary stud 6 which on tends in the slot 7 in-said bolt, in rigid relation with said lock casing 2. Said bolt 1 has a pair of parallel studs 9 and 10, in rigid relation therewith, which carry the series of eight fences 12. Each of said fences has two slots, 13 and I l, respectively fitted to said studs 9 and 10; a sprlng 17, which Ill?) tends to thrust the fence downwardly, with reference to Figs. I and and IV; and a tongue 18 adapted to fit respective gatings in the main tumblers hereinafter described. Said fences are separated by partition plates 20, conveniently formed of thin sheet brass stampings having respective holes 21 and 22 for said studs 9 and and a hole 24 for another stud 25, which projects from said slide bolt 1 in rigid relation therewith, and holds the ends of said springs 17 away from the wall of said casing 2..

Said fences 12 being all of the same pattern, may be all held at the same level, or shifted to respectively different levels,'in opposition to the thrusts of their respective springs 17, so as to present their tongues 18 in different positions with respect to the main tumblers, and thus require correspondingly different combinations of the latter. Such setting of the fences is effected by different setting keys, of which the key 27 shown in Fig. XVII, is an example. Such keys may be inserted in the keyway 28 of the rotary key hub 29, which is journaled in the bearing 80 in the back of the lock casing 2 and in the bearing 31 in the front cover plate 8. Such a key 27 may be inserted at the back of the lock with its tip 32 extending into said face plate 3 and with its bittings 34 respectively supporting said fences 12 at different levels in accordance with their radial extent from the axis of rotation of said key hub 29. i In order to insert or remove a setting key with respect to said hub 29, it is necessary for the keyway 28 of the latter to be turned to horizontal position in registry with the notch 36 in the casing. However, each such setting key has a notch 37, near its outer end, which is adapted to receive the edge of the casing at said bearing so as to permit said key 27 to be turned when properly inserted, but prevent it from being turned until thus inserted. Said key hub 29 has the cam 38 formed in unitary relation therewith and projecting inwardly from the. inner face of the back wall of said casing 2, so that when said key hub 29 is turned to the position to'receive the setting key; said cam 38'uplifts, to the position indicated in. dotted lines in Fig. XX, the arm 39 0f the detent lever 40, which is fulcrumcd upon the stud 41 in the casing 2 and has the spring 42 bearing against the rib 3 in said casing tending to normally thrust said lever to engage said key 27 in the. detent lever slot 44, so as toprevent said setting key 27 from being returned and withdrawn until it is released from said detent lever 40. Such release is effected by the arm 45 of said lever which is presented in cooperative relation with the stud 46 on said slide bolt 1. However, the arrangement is such that said stud 46 does not trip detent lever 40 unless and until said locking bolt 1 is retracted to the abnormal position above contemplated and illustrated in Figs. VII and XXI. s

Said partitions 20 also separate the eight main tumblers 48 which are pivoted upon the stud 49 which extends through the holes 50 in said tumblers and is in rigid relation with said casing 2; so that said fences and tumblers are separated in corresponding pairs by said partitions 20, and said locking bolt 1 can only be shifted to unlocked position when said main tumblers 48 are presented with their respective gratings 51 in registry with the projecting fence tongues Each of said main tumblers 48 has a spring 58 arranged to bear upon the wall-of said casing 2, so as to press the key sweep edge 54 of said tumbler downwardly, with reference to Figs. I and IV, and, normally, in contact with the main rotary key hub 56, which is journaled in the bearing 57 in said casing 2 and in the bearing 58 in said casing tent lever 40. Said hub 56 has, in diametrically opposite radial relation, the keyway 64 for said main key 62, and the keyway 65 for the guard key 66 shown in Fi XIII. The construction and arrangement are such that said hub 56 with its cam 60 is free to turn one-sixth of a revolution clockwise, before said cam encounters the shoulder 67 on the slide bolt 1, and consequently without effecting any movement of said boltand, when said hub 56 istlius turned, the stop lug 68, which is in unitary relation with said cam 60 thereon, encounters the hook end of the stop lever 70 which is pivoted on the stud 71 which extends through the opening 72 in said lever. Said stop lever 70 is provided with the spring 78 which bears against the wall of said casing 2 and normally presents said lever 70 in position to thus stop the rotation of said hub 56 and its cam 60.

I provide means to release said stop lever 70 by manipulation of said guard key 66, and including the slide plate 75'which has slots 76 and 77 re3pectively fitted to said screw socket 5 and said pivot stud 71; which are both in rigid relation with said casing 2 and serve as supporting bearings for said plate 7 5. Said plate 75 has, rigidly projecting from the back thereof, the stud 78, which fits in the notch 79 of said stop lever 70 so that, when said plate 75 is slid to the left in Figs. I and IV, said lever is depressed and disengaged from said stop lug 68 on the cam 60. However, such sliding movement of the plate is normally prevented by the stump which projects forwardly there from in rigid relation therewith and which normally encounters the tree edges of the auxiliary guard tumblers 82, of which there are live, pivoted upon said screw socket 5 which extends through holes 83 in said tu1nblers 82. Each of said tumblers 82 has a spring 85 hearing against the wall of said casing 52 so as to thrust said tumbler up-' wardly toward said hey hub 56. However, each of said guard tumblers 82 has a projection 86 which limits its upward movement by contact with said stump 80. Each of said tumblers 82 has a gating 87, all of which must be registered with said stump 80 to permit said slide plate 75 to be slid, to the left, as in Fig. V, to release said stop lever 70 from the path of the stop projection 68 on the cam 60. Such registration of the gatings 87 of the guard tumblers 82 may be ellected by inserting the guard lrey 66 in its keyway 65 in the rotary lzey hub 56 and turning the latter, clockwise, one-sixth of a revolution. Such movement of said guard key 66 causes it to first depress said tuu'iblers 82, into the proper relative position, by traversing the sweep edges 89 thereof, and thereafter said key 66 encounters, with its hitting 90, theshoulder 91 on said slide plate 75, sothat the aforesaid rotary movement of said hub 56 is accompanied by sliding move ment of said plate 75 to the extent limited by the slot 76 therein and leaves said plate with its stump 80in the respective gatings 87 of said guard tumblers In order to restore said auxiliary guard tumblers 82 and slide plate 75 to their normal position, shown in Fig. IV, in which said plate 75 is shifted to the right, to the extent limited by its slot 77 I provide means incluriliug the restoringlever 02 which is pivoted upon said screw socket 5 which e2;-

tends through the hole 93 in said lever,

Said restoring lever 92, which is normally in the lowered position shown in Fig. l is uplifted into the path of the stud 9% on said slide bolt 1, by the stump 80 encountering; the cam edge 95 on said lever 92when said plate 75 is shifted to the left, by the guard key 66, as above described. The position of said restoring lever, when thus shifted by the guard key, is shown in Fig. V, and is such that when said slide bolt 1 is shifted to the right, to the unlocked position shown in Fig. VI; said stud 9% on said bolt rides over the free end of said lever 02, depressing the latter against said stump 80 and thereby shitting said stump out of the gatings 87 of said tumblers 82, permitting them. to be rcstored to their original position by their springs 85,

plate 75, by saidstump 60, position, to the extreme righ F IV. 1

The normal unlocking iovement of said bolt 1, toward the right in l i s. l and 1 is limited by tl-e stump 06 which extends tor-- wardly from :;aid bolt in rigid relation therewith and is adapted to normally abut against the left hand edges o'lthe set of six change tru'nblers 0'? which are pivoted upon the stud 08 which extends in the holes 00 oli said tumblers and is in ri l ion with said casing 52. Each of said trunble a spring 101 arranged to bear a end wall of said casing 2 so as to normally press said change tumblers 07 downwardly with reference to l l and ii. However, each 01 said change blllllJlQlS 9'? has a gating plied to receive 3 stump 6 when presented in registry v; oh the l or, and has a key sweep edge 103 adapted to be engod by the changb key 105, shown in Fig. 'lll, when that lrey is inserted in the keya 106 in the rotary key hub 10? which is journaled in the bearing 108 in said casing 23 and in the bearing-109 in said casing cover .ilowever, said change key can d when said hub 107 is turned r gisters with the notch 110 in said casing 2.

ihe mechanism above described is ordinarily operated as follows: Said mechanism being in the locked position shown in Figs.

to IV inclusive; the guard key 66 is inserteo in the lteyway 65, with the latter in registry with the notch 112 in the nosing bearing 58 in said casing cover 3; which is the only position in which said guard hey may be inserted. Said guard key 66 then turned, to turn said main key hub 56 onesixth of a revolution clockwise. Such movement sweeps the guard tumblers into position to receive the stump 80 on the slide plate 75 and shift said plate to the left to engage said stump in the gratings '87 oi said tumblers 82; incidentally, by said. movement of the plate 75 carrying the stud T6, the stop lever Z0 is shifted dovmwardly out of the path. of the stop lug 66 on said cam '60 carried by said lrey hub and also upli'lts said restoring lever 02 in position to be ultimately encountered by the stud 9% on said slide bolt 1. Said guard key 66 is then re turned to the position in which it r ,lStPlS with said notch 112 and is withdrawn. As before noted; such turning movement of the main key hub 56 does not shift the locking bolt 1, because too cam 60 on said hub is free to turn to the extent of one-si1-zth of a revolution in the recess 61 in said locking bolt, without said cam encountering the shoulde 67 on said locking bolt 1, by which the latter is shifted to unlocked position.

- As above contemplated; such guard keys,

H ll

as exemplified at 66, are in possession of the lessor, and the aforesaid operation of the lock thereby is prerequisite to the opening movement of the lock by the lessee who is in possession of the main key for wl "oh the lock mechanism has been set and, for instance, the key 62 shown in XIV for which the fences 12 have beenset by the setting key 27. shown in Fig. XVII. Thereupon, said key 62 is inserted in the. keyway 64 in said key hub 56 which keyway then registers with the notch 11 1 insaid nosing bearing 58, and said main key is turned onequarter revolution. clockwise and thus turns said key hub 56 and its cam to slide the locking bolt 1 to the unlocked position shown in Fig. VI. Such'movement of the locking bolt causes the stud 94 thereon to ride over the end of said restoring lever 92 and thus depress the latter to its original position shown in Fig. IV, which shifts the stump out of the gatings 87 in the guard tumblers 82. and thus permit-s those tumblers to be upturned, by their respective springs 85, to their original position shown in Fig. IV. Of course, such movement of said stump 8O shifts the plate 75 with which it is rigidly connected and disengages the, stud 78 on said plate from the stop lever 70, back into the notch 79 of the latter, so as to permit said stop lever to be uplifted, by its spring "."3, into the path of the stop projection 68 on said key hub cam 60; after said cam has been turned back to bolt projecting position. Said locking bolt 1 may be shifted, to the left in Fig. VI, by returning said main key 62 to the original position in which it was inserted. Said key cannot be withdrawn until thus returned and, consequently, it is necessary to shift the locking mechanism into locked position before said main key 62, which is held by the lessee, may be withdrawn.

In order to change the combination of the lock mechanism aforesaid, the mechanism is shifted to unlocked position, as above described and, while the key 62 remains in the lock, in that position, the change key 165, shown in Fig. XVIII, is inserted, at the back of the lock, in the keyway 106 of the key hub 107, while in registry with the notch in the casing 2, and said key is then turned one-quarter revolution, counter-clockwise, as viewed fromthe back of the lock. Such movement sweeps the change tumblers 9? upwardly, to cause their gatings 162 to register with the stump 96 on said locking bolt 1. Thereupon, said main key 62 is turned an additional one-quarter revolution clockwise, until it registers with. the guard key'notch 112 in the bearing 58-, when. it may be withdrawn. Such abnormal movement of the locking bolt 1 causes its stud 46 to rock the detent lever 10 by. its arm 45 so as to uplift its arm 39 and free the setting key 27 from the notch 4 1 in said detent lever 40. 'lhereupon, said setting key may be turned one-quarter revolution, clockwise, as viewed from the -back of the lock, conre iently by the loose wrenclrhandlello, shown in elevation'in Fig. XVI, which has a notch 116 in which the rear end of said key 27', or any other similar setting key, may

be engaged in transverse relation to said handle. Said setting key being thus shifted to register with the notch 36 in the bearing the point of a screw driver in either of the keyways 64' or 65 of said hub 56, but I prefer to provide, for'that purpose, the dummy key 118 shown in Fig. XIX, which does not interfere with any of the main tumblers 48. Said locking bolt 1 being shifted to the locked position shown'in Figs. I to IV inclusive, a new setting key, for instance, the key 119 shown in Fig. XVI, isinserted in the keyway 28, in lieu of the original setting key 27. made when said keyway 28 is in registry with'the notch 36 in the bearing 30, at the back of said casing 2. Said new setting key 119 is then turned one-quarter revolution, counter-clockwise as viewed from the back of the lock, while the detent lever 40 isupheld by the cam 38 and until said setting key reaches its vertical position, in registry with the notch 44 in the detent lever 10; whereupon, said detent lever is automatically shifted by its spring t2to engage the notch 4- 1 in its arm 39 over the edge of said setting key 119; to thus automatically retain the latter until released in the manner above described with reference to the release of the original setting key 27;

Of course, the new setting key 119 uplifts and thus sets the several fences 12 to form a new combination and in correspondence therewith the new main key 121, shown in Fig. XV, is provided with bittings, in oppositely counterpart relation to the bit-tings of said setting key 119, so as to be capable of setting the main tumblers 48 with their gatings 51 registering with-the tongues 18 of said fences 12, as set by said new key 119, and the lock may be'operat'ed, by said new main key 121, after the lock has been manipulated by. the guard key 66 in the 1113.1}1161' abovedescribed. It is obvious that the mechanism above described is adapted for a largenumber of differentcombinations incident to changes in the relative positions of said fences 12, of which I have shown eight, but of which Of course, such insertion must be tee more or less may be used; the gatings 51 in the main tumblers 48 being very accurately fitted to the width of the fence tongues 18. Moreover, the auxiliary guard tumblers 82, of which I have shown live, but of which more or less may be used, may be transposed in the order in which they are assembled in the lock casing and may have their gatings S7 placed in different positions from those shown. Likewise, the change tumblers .97, of. which I have shown six, but of which more or less may be used, may be transposed in their arrangement in the look casing and may have their gatings 102 placed 'in'difien e'nt positions from those shown. I

' Therefore, I do notdesire to limit myself to the specific details of construction and ar rangement above described, as it is obvious that various modifications may be' made therein without departing from the essential features of my invention, as defined in the appended claims.

I claim:

1. In a lock, the combination with a casin of a movable locking'bolt in said casing; a series of reciprocatory fences, in said casing, arranged to be set in different relative positions by key controlled means; setting means arranged to detain said fences for a given combination, constructed and arranged to be immovable until released by operation of a key; and a series of tumblers in said casing arr nged to be set in different relative positions by key controlledmeans; whereby said bolt is held against movement except when said tumblers are set to cooperate with said fences.

2. In a lock, the combination with a casing; of a reciprocatory locking bolt in said casing; a series of similar reciprocatory fences, in said casing, arranged to be set in different relative positions by key controlled means; setting means arranged to detain said fences set for a given combination, con structed and arranged to be immovable until released by operation of a key; series of similar tumblers in said casing arranged to be setin different relative positions by other key controlled means; whereby said bolt is held against movement except when said tumblers are set to cooperate with said a ti. ECL- fences.

3. In a lock, the combination with a casing; of a movable locking bolt in said casing; a series of fences, in said casing, carried by said bolt and arranged to be set in different relative positions by key controlled means; setting means arranged to detain said fences set for a given combination, con structed and arranged to be immovable un til released by operation of a key; and a series oftumblers in said casing arrangedto be set in differentrelative positions by key controlled means, whereby said bolt is held e /ace? against movement except when said tumblers are set to cooperate with said fences.

t. Ina changeable combination key lock, the combination with a casing; of a movable locking bolt in said casing; a series of relatively adjustable fences in said casing; a series of relatively adjustable main tumblers in said casing; key controlled means, accessible from the back of the lock, adapted to adjust said fences and including a setting key of distinctive configuration for a single combination and means detaining said setting key in engagement with said fences until released by another key; and key controlled means, accessible from the front of the lock, adapted to adjust said tumblers in cooperative relation with said fences and permit said bolt to be unlocked.

5. In a changeable combination key lock, the combination with a casing; of a n1ov able locking bolt in said casing; a series of relatively adjustable fences in said casing, carried by said bolt; a series of relatively adjustable main tumblers in said casing; key controlled means, accessible from the back of the lock, adapted to adjust said fences; and key controlled means, accessible from the front of the lock, adapted to adjust said tumblers in cooperative relation with said fences and permit said bolt to be unlocked.

G. In a changeable combination'key lock, the combination with a casing; of a reciprocatory locking bolt in said casing; a series of relatively adjustable fences in said casing; a series of relatively adjustable oscillatory main tumblers in said casing; key controlled means, accessible from the back of the lock, adapted to adjust said fences; and key controlled means, accessible from the front of the lock,.adapted to adjust said tumblers in cooperative relation with said fences and permit said bolt to be unlocked.

7. In a changeable combination key lock, the combination with a casing; of a reciprocatory locking bolt in said casing; a su-ics of similar relatively adjustable reciprocatory fences in said casing; a series of relatively adjustable main tumblers in said casing; key controlled means, accessible from the back of the lock, adapted to adjust said fences; and key controlled means, accessible from the front of the lock, adapted to adjust said tumblers in cooperative relation with said fences and permit said bolt to be unlocked.

8. In a changeable combinathm lacy lock, thecombination with a casingof a movable lock bolt in said ca. g; a series of relative ly adjustable fences in said casing; setting means arranged to detain said fences set for a given combination, constructed and arranged to be in'imovable until released operation of a key; a series of relatively adjustable main tumblers in said casing; a series of relatively adjustable guard tumblers in said casing; and key controlled means whereby said fences and tumblers may be adjusted and said bolt shifted from locked to unlocked position.

9. In a changeable combination key lock, the combination with a casing; of a lock bolt mounted to reciprocate in said casing; a series of similar relatively adjustable reciprocatory fences in said casing; setting means arranged to detain said fences set for a given combination, constructed and arranged to' be immovable until released by operation of a key; a series of similar relatively adjustable main tumblers in said casing; a series of relatively adjustable guard tumblers in said casing; and key controlled means whereby said fences and tumblers may be adjusted and said slide bolt shifted from locked to unlocked position.

10. In a changeable combination key lock, the combination with a casing; of a lock bolt mounted to reciprocate in said casing; a series of similar relatively adjustable fences in said casing, carried by said bolt; setting means arranged to detain said fences set for a given combination, constructed and arranged to be immovable until. released by operation of a key; a series of similar relatively adjustable main tumblers in said asing; a series of relatively adj ustablo guard tumblers in said casing; and key controlled means whereby said fences and tumblers may be adjusted andsaid slide shifted from locked to unlocked position.

11. In a changeable combination key lock, the combination with a casing; of a movable lock bolt in said casing; a series of relatively adjustable fences in said casing; setting means arranged to detain said fences set for a given combination. coiuitrimted and arranged to be immovable until released by operation of a key; a series of relatively ad justable main llllll'llJlGlS in said casing; a series of relatively adjustable guard tumblers in said casing; a series of relatively adjustable elm-1153c tumblers in said casing; and. key controlled mean whereby said fences and tumbl. rs may be adjusted and said bolt shifted from locked to unloc ted position.

12. In av changeable combination key lock the combination with a casing; of a lock bolt mounted to reciprocate in said casing; a series of V rocatory fences in said casing; a series of similar relatively adjustable main. tumblers in said casing; setting means arranged to detain said fences set for a given combination, constructed and arranged to be immovable until released byoperation of a key; a series o'l relatively adjustable guard tumblers in said casing; a seriesof relative- 1y adjustable change tumblers in said casing; and key controlled means whereby said fences and tumblers maybe adjusted and similar relatively adjustable recip said slide bolt shifted from locked to unlocked position. v

13. In a changeable combination key lock, the combination with a casing; of a lock bolt mounted to reciprocate in said casing; a ries of similar relatively adjustable fences in said asing carried by said bolt; setting means arranged to detain said fences set for a given. combination, constructed and arranged to be immovable until released by operation of a key; a series of similar relatively adjustable main tumblers in said casing; a series of relatively adjustable guard tumblers in said casing; a series of relatively adj ustable change tui'nblers in said casing; and key controlled means whereby said fences and tumblers maybe adjusted and said slide bolt shifted from locked to unlocked position. 7

14. In a changeable combination key lock, the combination with a casing containing a series of relatively adjustable fences and a series of relatively adjustable tumblers arranged to cooperate with said fences; of key controlled means arranged to set said fences, and including a setting key of distinctive configuration for a single combination and means detaining said'setting key in engagement with said fences until re.- leased by anotherkey; and key controlled means arranged to set said tumblers; the keys for said fences and tumblers having corresponding bittings. j a v 15. In a changeable combination key lock, the combination with a casing containing a series of relatively adjustable fences and a series of relatively adjustable tumblersarranged to cooperate with said fences; of key controlled means, acce sible from the back of said lock to set fences; and key controlled ineans, accesible from the front of said lock, arranged to set said tumblers; the keys for said fences and tumblers having corresponding bittings, presented in reverse position.

16. In a changeable combination key lock, the combination with a casingcontaining a series of relatively adjustable reciprocatory fences and a series of relatively adjustable oscillatory tuu'lblers an... ed to cooperate w'th said fences; of .tey controlled means, accessible fron'i the back of said lock, arranged. to set said fences; and key controlled means accessil'ilefron'i the iront of said lock arranged to set saidtumblors; the keys for said fences and tumblers having come spendingbittings in reverse relation.

17. In achangeable combination key lock;

the combination with a casing containing a series of relatively .djustable fences and 1'- a series of relatively ustable tumblers arranged to cooperate with said 'fences;'setting means arranged todetain said fences set for a given combination constructed and arranged to be immovable until released by operation of a key; of a rotary key hub, arranged to'set said. fences; and a rotary key hub, arranged to set said tumblers; the keys for said fences and tumblers having corresponding bittings.

18. In a changeable combination key lock, the combination with a casing containing a series of relatively adjustable fences and a series of relatively adjustable tumblers arranged to cooperate with said fences; setting means arranged to detain said fences set for a given combination, constructed and arranged. to be immovable until released by operation of a key; of a rotary key hub, accessible from the back: of said lock, arranged to set said fences; and a rotary key hub, accessible from the front of said lock, arranged to set said tuml'ilers; the keys for said fences and tumblers having corresponding bittings.

19. In a lock, the combination with a casing; of a movable bolt in said casing; a series of fences, carried by said. bolt, and movable thereon; a rotary key hub journaled in said casing, arranged to receive a setting key in cooperative relation with said fences; whereby said fences may be set in different combinations by different setting keys;

and movable means arranged to normally detain said hub with a setting key in operative position.

20. In a lock, the combination with. a casing; of a bolt mounted to reciprocate in said casing; a series of fences, carried by said bolt, and mounted to move thereon transversely to the direction of reciprocation of said bolt; a rotary key hub journaled in sa d casing, arranged to receive a settlng key in cooperative relation with said fences; whereby said fences may be set in different combinations by different setting keys; and movable means arranged to normally detain said hub with a setting key in operative position, including a lever pivoted in said casing. a

21. In a lock, the combination with a casing; of a bolt mounted to reciprocate in said casing; a series of fences, carried by said bolt, and mounted to reciprocate transversely to the direction of reciprocation of said bolt; a rotary key hub journaled in said casing, arranged to receive a setting key in oooperative relation with said fences; whereby said fences may be set in different combinations by different setting keys; means arranged to normally detain said hub with a setting key in operative position, including a hook lever pivoted in said casing; and

means, operative by said bolt, arranged to release said hook lever.

22. In a lock, the combination with a cas- 'ing; of a bolt mounted to reciprocate insaid casing; a series of similar fences, carried by said bolt and mounted to rec procate thereon transversely to the direction of reciprocation of said bolt; a rotary key hub in said casing, arranged to receive a setting key in cooperative relation with said fences; whereby said fences may be set in different combinations by different setting keys; means arranged to normally detain said hub with said setting key in operative position, including a lever pivoted in said casing; and means, including a stud, carried by said bolt, arranged to release said lever, when said bolt is shifted to an abnormal extent.

28. In a changeable combination key lock, the combination with a casing; of a movable locking bolt in said casing; a series of relatively adjustable fences in said casing; a series of relatively adjustable main tumblers in said casing; said main tumblers being arranged to be set in a given combination by a key also adapted to move said locking bolt to unlocked position; and means arranged to set said fences in cooperative relation with said. tumblers, including a setting key and means detaining said setting key in said lock to maintain a given combination.

2%. In a changeable combination key lock, the combination with a casing; of a movable locking bolt in said casing; a series of relatively adjustable fences in said casing; and means arranged to set said fences in a given con'ibination, including a rotary key hub having a keyway, and a key which is fitted to said keyway and means detaining said key in said lock to maintain a given combination of said fences.

25. In a changeable combination lock, the combination with a casing; of a movable locking bolt in said casing; a series of movable fences insaid casing; a series of main tumblers in said casing, arranged to cooperate with said fences; means arranged to set said fences in different combinations, including a rotary key hub having a keyway accessible from the back of the look; a series of setting keys fitted to said keyway and having different combinations of bittings; means arranged to set said tumblers in combinations corresponding with the combinations of said fences, including a rotary key hub having a keyway accessible from the front of said lock; whereby said lock is adapted for operation by a series of main keys having bittings corresponding with the bit-tings of said setting keys, but in reverse relation thereto. j

26. In a changeable combination lock,the combination with a casing; of a movable locking bolt in said casing; a series of movable fences in said casing; a series of main tumblers in said casing, arranged to, cooperate with said fences; means arranged to set said fences in different combinations, including a rotary key hub having a setting kcyway accessible from the back of the lock; means arranged to set said tumblers hit) in combinations corresponding with the combinations of said fences, including a rotary key hub having a main keyway accessible from the front of said lock.

27. In a changeable combination lock, the combination with a casing; of a reciprocatory locking bolt in said casing; a series of reciprocatory fences in said casing, on said bolt; a series of oscillatory main tumblers in said casing, having gatings arranged to cooperate with said fences; means arranged to set said fences in different combinations, including a rotary key hub having a setting keyway accessible only from the back of the look; a series of interchangeable setting keys fitted to said keyway and having different combinations of bittings; means arranged to set said tumblers in combinations corresponding with the combinations of said fences, including a rotary key hub having a keyway accessible from the front of said lock; whereby said lock is adapted for operation by a series of interchangeable main keys respectively corresponding with said setting keys.

28. In a lock, the combination with a casing; of a movable locking bolt in said casing; means operable to shift said bolt to and from locked and unlocked positions, including a rotary main key hub journaled in said casing, having respective 'Ways for a guard key and a main key, and having a cam arranged to engage said bolt, and a guard stop lug; a guard stop lever pivoted in said casing and spring pressed to normally engage said hub stop lug and prevent opening movement of said bolt; means adapted to release said stop lever from said hub lug, including a slide plate mounted to reciprocate in said casing and having a stud adapted to engage and shift said stop lever, to idle position, when said, plate is moved in one direction, and to release said stop lever, to active position, when said plate is moved in the opposite direction; means arranged to normally prevent movement of said plate to release said stop lever, including a stump on said plate, and a series of guard tumblers having gatings adapted to receive said stump, When roperly set; said guard tumblers having rey sweep edges adapted to be engaged by a guard key inserted in the guard keyway in said main hub; means, on said plate, arranged to cooperate With said guard key to shift said plate to position to release said stop lever; a plate restoring lever adapted to cooperate with the stump on said plate and arranged to be shifted, by a stud on said slide bolt, when the latter is shifted. to unlocked position, to restore said plate and guard tumblers to-their initial position; a series of fences in said casing; means arranged to set said fences in different relative positions, including a rotary setting key hub, journaled in said casing, and a setting key arranged to extend in said hub; and means arranged to detain said setting key hub with'said setting key in' cooperative relation with said fences, including a detent lever fulcrumed in said casing and having a hook arranged to engage said setting key; a cam, on said setting key hub, arranged to hold said detent lever away from said setting key, and permit it to engage said key, inaccordance with the rotary position of said hub; and means, carried by said bolt, arranged to dis engage said detent lever from said key, by abnormal unlocking movement of said bolt; means arranged to limit the normal unlocking movement of said bolt, but permit such abnormal unlocking movement of said bolt, including a stump on said bolt, and a series of change tumblers having gatings adapted to receive said bolt stump when said tumblers are properly set; and a rotary change key hub, journaled in said casing, in 00- operative relation with said change tumblers, and adapted to receive a change key to set said change tumblers.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsyl vania, this 22nd day of October, 1926.

FRANK W. JOHNSON. 

